This girl is Japanese. Even if it weren't for the spoken Japanese at about 3:00, the room's design and the girl's attitude and demeanor give it away. I've never seen traditional Japanese room designs in Malaysia. Also, just because Japanese porn stars scream like idiots doesn't mean actualy Japanese girls do. I've dated two so far, and I can assure you they've acted normal - timid, even.

The tatami floor mats and style of the sliding doors definitely makes it look like this video was shot in Japan (being the traditional style of decoration in a Japanese home). And at 2:55, the man whispers for her to squat down in Japanese: "????". So... I'm gonna go out on a limb here and guess she's Japanese.